About this 3D model

A Japanese-style spherical ice mold, as suggested by http://www.youtube.com/watch?v=cuwJEN3VG-Y and documented at http://blog.ussjoin.com/2012/01/making-the-mold.html. Made from aluminum, you just heat it under running water, then insert a block of ice: it simultaneously melts and freezes the ice to form a perfect, seamless sphere.